Collapsible core



March 17, 1925.

E. NELSON COLLAPSIBLE cons Filed sept. e. 1924 5 A?! P 25 x A TTORNE Y.

Patented Mar. 17, 1925.

'1 ment iii-Collapsible Gores,-.ofwhichrthe fol-- I p 1,530,283 l? A..r-E 'orrics.

Erma NELSON; OF NORTH BnYfoirrAaIoj cenanazl 1 GOLDAPSIVBLEI some.

Applicationjfile'd September To a whom it may concern:

Be it known that I, ELMERQN L N, a. subject of the King of Sweden, residing at North Bay,v in the District of Nipissing, Province of Ontario, Dominion of Canada, have invented anew and usefulxlmprove lowing is aispeeification. v v r My invention relates. to improvements .in collapsible cores, primarily intendech for. use in connectionwith the manufacture of hol low cement .Walls and. the like,. and maybe employed either singly or in sets...

One of the objects of the invention is to supply a collapsible core which may. be in- ,serted betweenthe inner andouten forms benot be reached by the concrete asthe' latter is being. poured.

fore pouring, and-whichcanbe, quickly and. easily removedafter the concrete orother=- plastic material has set.

' Another object of the invention is to so place the-expanding and contracting mechanism within. a collapsible core, that, it can- A. further, object of the invention, is. to

provide an expanding and. contracting. .mechanism, which cannot release andcollapse of. itsown accord when in position in; aform. p With these and other objects, in. view, ,my invention consists in certain. novelconstruction and combination. of parts, hereinafter more fully described with the aid; of. the accompanying drawings, and claimed.

Figure 1 illustrates a front view .of'the invention with the core surfaces expanded,

audpartly broken away, v v

Figure 2 shows a front view with the core surfaces in collapsed position, andpartIy broken away. 1 t Figure 3 is a side viewof Figure 1, and Figure 4: is a similar View of Figu re 2'.

' Figure5 shows a top view.

Referring more particularly to the drawings, 1 and 2 designate two substantially parallel core. surfaces, one side offeachjof;

'whioh' terminates in an inwardly inclined,

angle. portion as shown at 3 and 4:,..W'l1i0l1 are adapted to overlap each other. The opposite sides of the core surfaces 1 and'2 terminate in an open side 5. When'the cores are being used in .pairs they may be so arranged that the open sides 5 on one core en'- gages. the corresponding open side of the core next to it.v In the eventv of my cores being used singly the surfaces 1 and 2 should to the angle plates 19. p r of saidangl'e plates have hinges 20 attached a 1 92.4.1 swarm; "7 36.326;

terminate at. both sides in inwardly. inclined oi erlappingwangleportions as shown at 3 and 42 Or again, when more than twocjores mediate cores may, if desired, be open as are used in a series both sides of the intershownatfi. .The end 6 is 'Througlrthe latter, I andbetween thesurfaces 1 and;2,;the operatingleverSprojects. :This

le.ver-, issupported. in brackets. Sand 10 Se cured to the inner faceof thefisurface- 1.

The. inward. and. outward. movement. ofthe reached.

' I Secured-.130: thejopelzatingg lever. 8 intermediately ofits length, and projecting Onboth SIClQST-thBIGOf, are lugs.- 12. and. secured:v to the nner face of the core surface 1.. is a. bracket 13. To each of the lugs 12 an 21mm. ispivotal'ly attached, through. the opposite ends of these armsv pinsjl5 are mounted. which adaptedto form thebottom' I :of the core, and? .7 indicates. the top.

also pass throughoue enclofthe a1ims-16,.the,-. I

oppositeends of. which latter; are fulcrumed about. the, pin-17 mounted in the stationary bracket 13. mAs, the said bracket .is:sta tionary, and the. lugs 12 moveup and down: with the operating lever,.the.distance between the;

:lugst12. and. the bracket varies,, ancl' consequently the horizontal? distance between the pins15 and the'operating lever: 8 variespro- 'portionatel-y. f On the inner face of the core surface 1; and towards the topand bottom at .bothsides I secure hinges 18, which are also. attached The opposite ends thereto and also one end; of thelinks 24:, the,"

opposite ends of which latter are pivotally mountedv on'the inner side of, the core. surface 2. The hinges 20 EI-I'QH lSO secured to the arms 21, which are connected together in pairs at eachside by the pins 22, and are operated by the links 23" which extendfrom the said pins 22 to the pi'ns15.

' As the horizontal distance between the pins 15 and the operating lever 8 is decreased the links 23 are pulled towards the operating lever, and the arms 21, hinges 18 and 20,'angle plate .19, and links 24 move from n the position shown in Figure 3 to that shown in Figure 4:, with the result that the core surfaces 1 and 2 are drawn towards each other, so that the whole device may easily be removed from within the concrete which has been poured round it when the surfaces were in their expanded position as shown in Figures 1 and 3. The hinges 18 and 20 assume a rectangular position when the core is expanded and that obviates the possibility of accidental collapse of the device when in use.

In order to strengthen the surfaces 1 and 2 and insure their remaining in parallel alignmient, I prefer to strengthen them as by the angle irons 25.

lVhile in the foregoing I have shown and described the preferred embodiment of my invention, it is understood that I may make alterations and modifications thereto, pro vided the said alterations and modifications fall within the scope of what I claim.

Having thus described my invention what I claim is:

1. A collapsible core open at the top and bottom and having two substantially parallel core surfaces, and a substantially centrally located operating lever adapted to move longitudinally, in combination with arms pivotally attached one on each side of said lever, each arm adapted to coact with a separate system of levers, by the movement of which the distance between the core surfaces is varied from! both sides simultaneously.

2. A collapsible core having two substantially parallel core surfaces and an operatinglever arranged between said core surfaces and adapted to move longitudinally, in combination with arms pivotally attached to said operating lever and disposed one on each side thereof, each arm, being connected to a separate system of levers by means of which the transverse distance between said operating lever and each of said core surfaces may be varied.

3. A collapsible core as described in claim live wherein the core surfaces remain substantially parallel. to each other throughout the movement.

thereof, each of said arms being adapted to cooperate with a separate system of levers by the movement of which the distance between said core surfaces is varied.

5. A collapsible core as described in claim seven wherein the core surfaces remain parallel to each other throughout the movement.

6. A collapsible core as described in claim seven wherein the transverse distance be tween the operating lever and each of the core surfaces varies throughout the movement.

7 A collapsible core having two substantially parallel core surfaces, an operating lever slidably mounted in brackets secured inwardly on one of said core surfaces, lugs on said operating lever and disposed one on each side thereof, one swinging member revolvably mounted on each of said lugs, each of said swinging members being also adapted to coact with an arm, and each of said arms having its opposite end revolvably mounted about a fixed point, in combination with two separate systems of levers each actuated from the junction of said arms and said swinging members, said systems of levers being adapted to vary the distance between said core surfaces.

8. A collapsible core having two substantially parallel coresurfaces, hinges attached internally at two points on each side of one of said core surfaces, amember attached to each of said hinges, a second hinge atthe other end of each of said members connected also to an arm, the other core surface having links attached thereto, one link being in alignment with and pivotally mounted on each of said members, said arms coacting with levers adapted to be actuated by an operating lever, by means of which the dis tance between said core surfaces may be varied.

9. A collapsible core open at the top and bottom and having two core surfaces and an operating lever arranged between said core surfaces, said operating lever being adapted to move longitudinally and provided with stops to limit its movement in both directions, in combination with arms adapted to be actuated by said operating lever and disposed one on each side thereof, each of said arms being connected to a separate set of levers by the mbrement of which the distance between said core surfaces is varied from both sides of the core siinultaneouslv. 

